| Rank | Abbreviation | Meaning |
|---|
| ***** | ADEF | Allied Radio Frequency Agency Data Exchange Format
| |
| ***** | ADEF | African Development and Education Foundation
| |
| **** | ADEF | Association pour le Développement des Foyers
| |
| *** | ADEF | Asian Development Equity Fund
| |
| *** | ADEF | Association des Etudes foncières
| |
| *** | ADEF | Ambulatory Diabetes Education and Follow-Up
| |
| *** | ADEF | Asociación de Docentes de Educación Física
| |
| ** | ADEF | Adult Diabetes Education and Follow
| |
| ** | ADEF | Asociacion de Escuelas de Futbol
| |
| ** | ADEF | Apprentissage, Didactique, Evaluation, Formation
| |
| ** | ADEF | Association des Exportateurs de Films
| |
| ** | ADEF | Asociación Docentes de Educación Física
| |
| ** | ADEF | Arab Digital Expression Foundation
| |
| ** | ADEF | Asociacion de Empleados de Farmacia
| |
| * | ADEF | Ambulatory Diabetes Education Follow
| |
| * | ADEF | Arbeitskreises Deutsche England Forschung
| |
| * | ADEF | Autocads Digital Exchange Format
| |
| * | ADEF | Arbeitskreis Deutsche England Forschung
| |
| * | ADEF | Automated Data Element Finder
| |
| * | ADEF | ADVANCED DEFINITION SYSTEMS, INC.
| |
| * | ADEF | Abu Dhabi Economic Forum
| |